S70FS01GS datasheet(42/141 Pages) CYPRESS

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S70FS01GS

Document Number: 002-03833 Rev. *C

Page 42 of 141

Software Interface

This section discusses the features and behaviors most relevant to host system software that interacts with FS-S Family memory

devices.

Address Space Maps

7.1

Overview

7.1.1

Extended Address

The FS-S Family supports 32 bit (4 Byte) addresses to enable higher density devices than allowed by previous generation (legacy)

SPI devices that supported only 24 bit (3 Byte) addresses. A 24 bit, byte resolution, address can access only 16 MBytes (128 Mbits)

maximum density. A 32 bit, byte resolution, address allows direct addressing of up to a 4 GBytes (32 Gbits) address space.

Legacy commands continue to support 24 bit addresses for backward software compatibility. Extended 32 bit addresses are

enabled in two ways:



Extended address mode — a volatile configuration register bit that changes all legacy commands to expect 32 bits of

address supplied from the host system.



4 Byte address commands — that perform both legacy and new functions, which always expect 32 bit address.

The default condition for extended address mode, after power-up or reset, is controlled by a non-volatile configuration bit. The

default extended address mode may be set for 24 or 32 bit addresses. This enables legacy software compatible access to the first

128 Mbits of a device or for the device to start directly in 32 bit address mode.

7.1.2

Multiple Address Spaces

Many commands operate on the main Flash memory array. Some commands operate on address spaces separate from the main

Flash array. Each separate address space uses the full 24 or 32 bit address but may only define a small portion of the available

address space.

7.2

Flash Memory Array

The main Flash array is divided into erase units called physical sectors of 256 KBytes. The FS01GS contains two FS512S devices

stacked in a DDP. Both the lower and upper address FS512S devices must be configured to define the overall sector map of the

entire 1 Gbit (128 Mbyte) space selected by the CS# for the DDP. The lower address FS512S may be configured for bottom

parameter sectors or uniform sectors. The upper address FS512S may be configured for top parameters or uniform sectors. When

the lower address FS512S is configured for bottom parameter sectors the upper address FS512S must be configured as uniform

sectors. When the upper address FS512S is configured for top parameter sectors the lower address FS512S must be configured as

uniform sectors. In this way, the overall address space of the DDP may have bottom, or top parameter sectors, or uniform sectors.

No other configurations are supported.

Table 7.1

S70FS01GS Sector Address Map, Bottom 4 KB Sectors

Sector Size (KByte)

Sector Count

Sector Range

Address Range (Byte

Address)

Notes

SA00

00000000h-00000FFFh

Sector Starting Address

—

Sector Ending Address

SA7

00007000h-00007FFFh

224

SA8

00008000h-0003FFFFh

256

511

SA9

00040000h-0007FFFFh

SA519

07FC0000h-07FFFFFFh

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